CVE-2026-42171

Name	CVE-2026-42171
Description	NSIS (Nullsoft Scriptable Install System) 3.06.1 before 3.12 sometimes uses the Low IL temp directory when executing as SYSTEM, allowing local attackers to gain privileges (if they can cause my_GetTempFileName to return 0, as shown in the references).
Source	CVE (at NVD; CERT, ENISA, LWN, oss-sec, fulldisc, Debian ELTS, Red Hat, Ubuntu, Gentoo, SUSE bugzilla/CVE, GitHub advisories/code/issues, web search, more)

Vulnerable and fixed packages

The table below lists information on source packages.

Source Package	Release	Version	Status
nsis (PTS)	bullseye	3.06.1-1	vulnerable
	bullseye (security)	3.06.1-1+deb11u1	vulnerable
	bookworm	3.08-3+deb12u1	vulnerable
	forky, sid, trixie	3.11-1	vulnerable

The information below is based on the following data on fixed versions.

Package	Type	Release	Fixed Version	Urgency	Origin	Debian Bugs
nsis	source	(unstable)	(unfixed)

Fixed by: https://github.com/NSIS-Dev/nsis/commit/8e6f02205d5f22da6c7855dbfe59b2af667330ca (v312)